Card Grid with Featured Item

<div class="featured-grid-container">
  <div class="featured-grid">
    <!-- Featured Item -->
    <div class="featured-grid-item featured-item">
      <span class="featured-badge">Featured</span>
      <img src="https://source.unsplash.com/random/600x400?nature" alt="Featured item" class="featured-grid-item-image">
      <div class="featured-grid-item-content">
        <h3 class="featured-grid-item-title">Featured Article</h3>
        <p class="featured-grid-item-description">This is a featured article with a larger card size and more prominent display compared to other cards in the grid. It draws more attention.</p>
        <div class="featured-grid-item-footer">
          <span>May 15, 2025</span>
          <span class="featured-grid-item-tag">Nature</span>
        </div>
      </div>
    </div>
    
    <!-- Regular Items -->
    <div class="featured-grid-item regular-item">
      <img src="https://source.unsplash.com/random/400x300?technology" alt="Regular item 1" class="featured-grid-item-image">
      <div class="featured-grid-item-content">
        <h3 class="featured-grid-item-title">Regular Card 1</h3>
        <p class="featured-grid-item-description">A standard card in the grid layout.</p>
        <div class="featured-grid-item-footer">
          <span>May 12, 2025</span>
          <span class="featured-grid-item-tag">Tech</span>
        </div>
      </div>
    </div>
    
    <div class="featured-grid-item regular-item">
      <img src="https://source.unsplash.com/random/400x300?travel" alt="Regular item 2" class="featured-grid-item-image">
      <div class="featured-grid-item-content">
        <h3 class="featured-grid-item-title">Regular Card 2</h3>
        <p class="featured-grid-item-description">Another standard card in the grid.</p>
        <div class="featured-grid-item-footer">
          <span>May 10, 2025</span>
          <span class="featured-grid-item-tag">Travel</span>
        </div>
      </div>
    </div>
    
    <!-- Add more items as needed -->
  </div>
</div>

.featured-grid-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto;
  gap: 20px;
}

.featured-grid-item {
  background-color: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.featured-grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.featured-grid-item-image {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.featured-grid-item-content {
  padding: 15px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.featured-grid-item-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #333;
}

.featured-grid-item-description {
  font-size: 14px;
  color: #666;
  margin-bottom: 12px;
  line-height: 1.4;
  flex-grow: 1;
}

.featured-grid-item-footer {
  font-size: 12px;
  color: #888;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.featured-grid-item-tag {
  padding: 4px 8px;
  background-color: rgba(52, 152, 219, 0.1);
  color: #3498db;
  border-radius: 4px;
  font-weight: 500;
}

/* Featured Item */
.featured-item {
  grid-column: span 6;
  grid-row: span 2;
}

.featured-item .featured-grid-item-image {
  height: 260px;
}

.featured-item .featured-grid-item-title {
  font-size: 22px;
  margin-bottom: 12px;
}

.featured-item .featured-grid-item-description {
  font-size: 16px;
  margin-bottom: 15px;
}

/* Regular items */
.regular-item {
  grid-column: span 3;
}

/* Featured Item Badge */
.featured-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: #3498db;
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  z-index: 2;
}

/* Dark mode styles */
@media (prefers-color-scheme: dark) {
  .featured-grid-item {
    background-color: #222;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  }
  
  .featured-grid-item:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
  }
  
  .featured-grid-item-title {
    color: #fff;
  }
  
  .featured-grid-item-description {
    color: #aaa;
  }
  
  .featured-grid-item-footer {
    color: #777;
  }
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .featured-item {
    grid-column: span 6;
  }
  
  .regular-item {
    grid-column: span 6;
  }
}

@media (max-width: 768px) {
  .featured-grid {
    gap: 15px;
  }

  .featured-item {
    grid-column: span 12;
    grid-row: span 1;
  }
  
  .regular-item {
    grid-column: span 6;
  }
  
  .featured-item .featured-grid-item-image {
    height: 200px;
  }
}

@media (max-width: 576px) {
  .regular-item {
    grid-column: span 12;
  }
  
  .featured-grid-item-image {
    height: 180px;
  }
}

// Optional JavaScript for animating new cards when they enter the viewport
document.addEventListener('DOMContentLoaded', function() {
  // Check if Intersection Observer is supported
  if ('IntersectionObserver' in window) {
    const gridItems = document.querySelectorAll('.featured-grid-item');
    
    // Create intersection observer
    const observer = new IntersectionObserver((entries) => {
      entries.forEach(entry => {
        // Add animation class when element comes into view
        if (entry.isIntersecting) {
          entry.target.classList.add('animated');
          // Stop observing after animation is applied
          observer.unobserve(entry.target);
        }
      });
    }, {
      root: null, // Use viewport as root
      threshold: 0.1 // Trigger when 10% of the item is visible
    });
    
    // Observe all grid items
    gridItems.forEach(item => {
      observer.observe(item);
    });
  }
  
  // Optional animation for the featured badge
  const featuredBadge = document.querySelector('.featured-badge');
  if (featuredBadge) {
    // Add a simple pulse animation
    setInterval(() => {
      featuredBadge.classList.add('pulse');
      setTimeout(() => {
        featuredBadge.classList.remove('pulse');
      }, 1000);
    }, 3000);
  }
});